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FANCY COLOR DIAMOND
Dazzling brilliance. Captivating color. The planet’s most valued gems are fancy color diamonds.
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Lab-Grown Colored Diamonds from Chatham Created Gems
This article compares some of Chatham Created Gems’ synthetic colored diamonds to natural diamonds and explains the results.
An Investigation into the Cause of Color in Natural Black Diamonds from Siberia
Black and dark gray diamonds from Siberia, Russia, were studied by analytical scanning and transmission electron microscopy.
An Important Exhibition of Seven Rare Gem Diamonds
The stories behind seven strikingly beautiful rare natural diamonds, united in an exhibit at the Smithsonian, are told here.
Gemesis Laboratory-Created Diamonds
High-quality synthetic diamonds created by the Gemesis Corp. are examined and their gemological properties are explicated.
Characterization and Grading of Natural-Color Pink Diamonds
Known for their great beauty and rarity, pink diamonds have long been sought after by jewelers, collectors, and consumers.
Identification of HPHT-Treated Yellow to Green Diamonds
Greenish yellow to yellowish green HPHT-treated diamonds exhibited highly saturated body color, well-defined brown to yellow octahedral graining, and visual evidence of heating, among other characteristics.
Characterizing Natural-Color Type IIB Blue Diamonds
More than 400 blue diamonds were studied at the GIA Gem Trade Laboratory over several years to reveal additional information about the relationships between their color, clarity, and other gemological properties.
Color Grading of Colored Diamonds in the GIA Gem Trade Laboratory
How GIA’s Gem Trade Laboratory grades colored diamonds, including an expanded color grading terminology, is explained
The Gemological Properties of Russian Gem-Quality Synthetic Yellow Diamonds
Russian-grown gem-quality synthetic diamonds are being sold for jewelry; this article presents the results of a gemological examination of a group of yellow samples.
De Beers near Colorless-to-Blue Experimental Gem-Quality Synthetic Diamonds
De Beers has produced a faceted synthetic gem-quality diamond that could go unrecognized without careful gemological testing.
Diamond Sources and Production: Past, Present, and Future
Diamond production’s future appears to belong less to Africa and more to Australia, Canada, and the Russian Federation, according to this overview of geologic trends in the industry.
Spring 1991 G&G Lab Notes
This section, from the Spring 1991 issue of Gems & Gemology, is a compilation of interesting finds from GIA’s laboratories.
